When partaking in a gangbang with multiple gents & only one female, the double dip rule governs that the person to spearhead the campaign must also go last after everyone else has had their turn.

On arriving at the gangbang gary enthusiastically stated "IM FIRST!!"
Kenneth immediately pointed out the double dip rule "if you go first you have to go last aswell, double dip rule... Its gangbang etiquette"